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how does a x2 gpu affect my pci slot speed

post #1 of 2
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So I want to finish my spider build with four Gpu's. but realised that four cards slows down the speed from 16x to 8x so the realised gains are minimal. does this also apply if you use 2 say 4870x2 cards or do they stay in 16x because it is only two physical cards?
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"The Black Widow"
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Phenom 9850BE Asus M3A32-MVP Deluxe/WiFi 790FX 2x4870 and 4870x2 when they come out Corsair Dominator 8GB (4x2GB) Duel Channel Kits 
Hard DriveOptical DriveOSMonitor
2x 300 gig Velociraptors 1TB Media Drive SAMSUNG|SH-S223F Vista Ultimate 64 24" Acer P243WAid 2ms(GTG) 
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Silverstone ST1000 1000w ATX12V NZXT TEMPEST w/Red LEDs 
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post #2 of 2
There is no difference in performance from 16x to 8x.

an x2 card is considered a single card as its crossfire interface is internal
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Murder Box II
(18 items)
 
Home PC
(15 items)
 
 
CPUMotherboardGraphicsRAM
Intel 6800K Asus X99-A II Zotac 1080Ti AMP Extreme Edition G. Skill Trident Z - 32GB/ 3200Hz/CL14/Quad  
Hard DriveCoolingOSMonitor
Sandisk Extreme Pro 480GB Corsair H100i V2 - w/ML120 Pro Fans Windows 10 Home 64 Bit Acer Z35P 1440P G-Sync 
KeyboardPowerCaseMouse
Steelseries Merc  EVGA Supernova G2 1000W Corsair 450D Mionix Naos 8200 
Mouse PadAudioAudioOther
Inwin Batmat Aluminum Sound Blaster Z Logitech Z906 - 5.1 Maxnomic Commander S-III Gaming Chair 
CPUMotherboardGraphicsRAM
Intel G3440 Asus B85M-E/CSM EVGA GTX 950 Patriot Viper 3 - 2x8GB 1600hz 
Hard DriveOptical DriveCoolingOS
Samsung EVO 850 - 500GB + 4TB/3TB x 2/2TB WD Green LG CH12LS28 Bluray Scythe Big Shuriken 2 w/Corsair SP120 Fan Windows 10 64 Bit 
MonitorKeyboardPowerCase
Samsung 75" TV.... GooBang Doo MX3 Corsair CX430 V2 NMEDIAPC HTPC 6000B w/ Pro LCD Module 
Mouse
GooBang Doo MX3 
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